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Vika [28.1K]
3 years ago
8

Many substances can go through physical and chemical changes. Which of the following is an example of a physical change? Questio

n 6 options: using heat and oxygen to burn wood using heat to scramble an egg mixing CO2 , water, and sugar to form soda mixing baking soda with vinegar to form CO2
Chemistry
1 answer:
Ann [662]3 years ago
3 0
Mixing baking soda with vinegar to form CO2

(Isn't the one used to make volcano models)
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1pt Which is an example of an alloy?<br> O A. steel<br> OB. salt water<br> O C. air<br> O D. iron
77julia77 [94]
Steel? Hope this helps?

4 0
3 years ago
consider the substance:carbon dioxide, gold, bronze, alcohol, iron, and, oxygen.from the list , select the substances that :(1)
lbvjy [14]

Answer:

Oxygen

Explanation:

 · Air decolorization makes use of chromophores’ instability on oxygen to decolorize the oil by air-oxidizing pigments. For example, the carotenoid and chlorophyll in the oil are very unstable because of their structure, which is easy to be discolored under the action of oxygen. However, air decolorization leads to thermal oxidation of the oil, too.

5 0
3 years ago
Round each number to four significant figures
ira [324]

Answer:

a.

84,791 » 8479

b.

256.75 » 256.8

c.

431,801 » 4318

d.

0.00078100 » 0.0007810

Explanation:

.

5 0
3 years ago
Find the percent composition of OXYGEN in Manganese (III) nitrate, Mn(NO3)3.
BaLLatris [955]

Answer:

59.8%

Explanation:

First find the Mr of manganese (III) nitrate.

Mr of Mn(NO₃)₃ = 54.9 + (14 × 3) + (16 × 3 × 3) = <u>240.9</u>

Since we have to find the percentage composition of oxygen, we need to find the Mr of oxygen in the compound, which is:

Mr of (O₃)₃ = (16 × 3) × 3 = <u>144</u>

Now we can find percentage composition / percentage by mass of oxygen.

% composition = \frac{Mr\ of\ oxygen\ in\ compound}{Mr\ of\ compound} × 100

% composition = \frac{144}{240.9} × 100 = <u>59.776%</u>

∴ % compostion of oxygen in maganese(III)nitrate is 59.8% (to 3 significant figures).

8 0
2 years ago
A temperature of 37C is equivalent to a temperature of
ss7ja [257]
Answer 98.6 Fahrenheit
8 0
3 years ago
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